I have an app, composed of:
- MySQL server
- scraper (node.js)
- app parse data from website and save it to MySQL.
- server (node.js)
- listening for upcoming connections over socket.io and serving data to the client.
- client (Vanilla JS/HTML)
server/controllers/SocketController.js
// Server: http server and socket init
const http = require('http').createServer();
const io = require('socket.io')(http, {
cors: { origin: "*" }
});
http.listen(3001,() => console.log('Server listening on 3001'));
server/Dockerfile
FROM node:16
WORKDIR /server
COPY /server/package.json .
RUN npm install
COPY /server .
EXPOSE 3001
CMD [ "node", "index.js" ]
web/app.js
// Client listen on localhost:3001
const socket = io('ws://server:3001/');
When working locally everything worked fine, then I decided to make my life miserable and try to dockerize the whole thing (using docker the first time).
First, everything went smooth, made MySQL, scraper, and server up and working just fine.
Then it came to the point I would need to set up Nginx webserver I did so inside docker-compose.yml
docker-compose.yml
version: "3.7"
services:
mysqldb:
image: mysql:5.7
container_name: mysql
restart: unless-stopped
env_file:
- ./.env
environment:
MYSQL_DATABASE: ${MYSQL_DATABASE}
MYSQL_ROOT_PASSWORD: ${MYSQL_ROOT_PASSWORD}
MYSQL_PASSWORD: ${MYSQL_ADMIN_PASSWORD}
MYSQL_USER: ${MYSQL_ADMIN_USERNAME}
ports:
- $MYSQL_PORT:$MYSQL_PORT
volumes:
- ./db:/docker-entrypoint-initdb.d
networks:
- celtra_lottery_network
scraper:
restart: unless-stopped
container_name: scraper
build:
context: .
dockerfile: ./scraper/Dockerfile
image: scraper
env_file:
- ./.env
ports:
- $NODE_SCRAPER_PORT:$NODE_SCRAPER_PORT
volumes:
- ./scraper:/scraper
- /scraper/node_modules
depends_on:
- mysqldb
stdin_open: true
tty: true
networks:
- celtra_lottery_network
server:
restart: unless-stopped
container_name: server
build:
context: .
dockerfile: ./server/Dockerfile
image: server
env_file:
- ./.env
ports:
- $NODE_SERVER_PORT:$NODE_SERVER_PORT
volumes:
- ./server:/server
- /server/node_modules
depends_on:
- mysqldb
stdin_open: true
tty: true
networks:
- celtra_lottery_network
client:
image: nginx
container_name: client
ports:
- 80:80
volumes:
- ./web:/usr/share/nginx/html
networks:
- celtra_lottery_network
links:
- server
volumes:
db-config: null
db-data:
networks:
celtra_lottery_network:
driver: bridge
When I open Nginx container in the browser, it shows the page but the data is not there. Strangely the console is not showing any error msg.
Already try it:
- Is the server inside docker running ✔️
- Is the server port exposed ✔️
- Change the client connection string to ‘0.0.0.0:3001’ ✔️
I assumed that I would connect to socket the same way I was connecting server and scraper to MySQL so:
- Host would be the docker-container-name
- Port would be the EXPOSE 3001 port that the server is listening on.
Question:
Can someone point out the problem in my code would be really grateful for any help.
